Steel fiber reinforced cementitious composites(SFRC) were treated as composite material, which consists of steel fiber and cement mortar. The whole process of tensile fracture for aligned steel fiber reinforced cementitious composites(ASFRC) was simulated on the basis of extended finite element method(XFEM). Mixed congruence algorithm was used to generate random number, and random generation algorithm of steel fibers was established, the numerical models with different content of steel fibers were established. Considering bond slip between steel fiber and mortar matrix, the whole process of tensile fracture for ASFRC was simulated, and the stress strain curves were obtained. The numerical simulation results were verified by conducting tension tests. The research shows that the complete curve results of numerical simulation match well with experimental results, the meso scale numerical model can contribute to reveal the tensile failure mechanism of SFRC.